CA3208542A1 - Process for producing a fibrous material web - Google Patents
Process for producing a fibrous material web Download PDFInfo
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- CA3208542A1 CA3208542A1 CA3208542A CA3208542A CA3208542A1 CA 3208542 A1 CA3208542 A1 CA 3208542A1 CA 3208542 A CA3208542 A CA 3208542A CA 3208542 A CA3208542 A CA 3208542A CA 3208542 A1 CA3208542 A1 CA 3208542A1
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- fibrous material
- material web
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/008—Steam showers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/0073—Accessories for calenders
- D21G1/0093—Web conditioning devices
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Abstract
Described is a process for producing a fibrous material web, in particular a process for producing a decor paper, comprising the steps of: -providing a fibrous material stream, - supplying the fibrous material stream in this sequence into at least one fibrous material head box, into at least one screening section for forming a fibrous material web, into at least one pressing section and into at least one drying section having drying groups, wherein in the pressing section a dry matter content of the fibrous material web in the range from 45% to 60% by weight is established, and wherein the fibrous material web is remoistened downstream of or in the drying section, wherein from 2% to 30%, in particular from 4% to 20%, preferably from 6% to 15%, based on the basis weight of the fibrous material web, of water is applied to the fibrous material web.
Description
Process for producing a fibrous material web Description The present invention relates to a process for producing a fibrous material web, especially a process for producing a decorative paper, to a fibrous material web, especially a decorative paper, especially obtainable according to this process, and to the use of the fibrous material web as decorative paper.
Decorative papers are usually special papers for surface finishing, for example of wood-based materials. Known decorative papers are mainly produced from hardwood chemical pulp. Such decorative papers can either be used directly in plain colours or printed with various designs. They are used, for example, for furniture surfaces, flooring and panels.
Decorative papers are generally printed in a gravure printing process. In this process, printing ink is usually delivered to the paper by an engraved roller.
Due to the interaction of paper colour and different printing inks, there are hardly any limits to the variety of decorative design. The print designs range from wood, stone through to fantasy decorations.
Decorative papers can be produced in a multitude of colours and area densities.
The surface either has a satin finish or is machine-glazed. Further important properties are high porosity, wet strength, light fastness and colour consistency.
In order to bond decorative papers to surfaces, for example to wood-based surfaces, they can be saturated, depending on the application, with melamine, urea or acrylate resins (impregnation). Due to their high absorbency and penetration capacity, decorative papers are able to absorb twice their own weight in resins.
Suitable decorative papers are preferably distinguished by a high wet strength and thus ensure smooth running through the impregnation unit.
Decorative papers are usually special papers for surface finishing, for example of wood-based materials. Known decorative papers are mainly produced from hardwood chemical pulp. Such decorative papers can either be used directly in plain colours or printed with various designs. They are used, for example, for furniture surfaces, flooring and panels.
Decorative papers are generally printed in a gravure printing process. In this process, printing ink is usually delivered to the paper by an engraved roller.
Due to the interaction of paper colour and different printing inks, there are hardly any limits to the variety of decorative design. The print designs range from wood, stone through to fantasy decorations.
Decorative papers can be produced in a multitude of colours and area densities.
The surface either has a satin finish or is machine-glazed. Further important properties are high porosity, wet strength, light fastness and colour consistency.
In order to bond decorative papers to surfaces, for example to wood-based surfaces, they can be saturated, depending on the application, with melamine, urea or acrylate resins (impregnation). Due to their high absorbency and penetration capacity, decorative papers are able to absorb twice their own weight in resins.
Suitable decorative papers are preferably distinguished by a high wet strength and thus ensure smooth running through the impregnation unit.
2 In order to guarantee optimal further processing during impregnation, suitable decorative papers have a very high absorbency. To cover dark substrate materials, such as chipboard or core papers, decorative papers can also be provided with fillers. Suitable fillers are white and coloured pigments that have a very high light fastness and are as chemically resistant as possible.
Decorative papers are usually bonded to the surfaces, especially wood-based panels, using pressing and laminating equipment. The sometimes high temperatures and corresponding pressures in the presses cause the impregnated resin to cure. In this process, the decorative paper is bonded to the wood-based material. In the laminating process, this is usually done using hot-melt adhesives. Structured press plates can be used to give the wood-based materials an almost lifelike surface feel.
Decorative papers as described above can be produced by known processes. These processes usually comprise the steps of first producing a material stream, which is then fed in succession to at least one headbox, at least one wire section for forming the fibrous material web, at least one press section, at least one dryer section having drying groups, and then to a reel.
Fibrous material webs, especially decorative papers, obtained by to such processes regularly have the features mentioned below. Due to a high dry matter content after the press section, especially when using a shoe press, the paper is influenced in that it experiences less "sticking" to the drying cylinders of the (first) pre-drying group in the dryer section. The term "sticking" is understood here to mean especially the adhesion of the moist paper web to the hot cylinder surface.
The cellulose fibres usually used for paper production swell when moisture/water is absorbed and shrink when water is released. As a result, the fibrous material web shrinks in the dryer section by approximately 1 - 5% over the entire dewatering and drying process. Due to the described "sticking", the paper web is hindered in its shrinkage.
When the fibrous material web then comes into contact with printing ink and/or resin during application to a surface and/or during the printing process, the paper can change size again and "grow". This takes place to approximately a similar degree as shrinkage during drying. Since, when using a shoe press, the paper web is drier when it enters the dryer section, it adheres less to the drying cylinder and
Decorative papers are usually bonded to the surfaces, especially wood-based panels, using pressing and laminating equipment. The sometimes high temperatures and corresponding pressures in the presses cause the impregnated resin to cure. In this process, the decorative paper is bonded to the wood-based material. In the laminating process, this is usually done using hot-melt adhesives. Structured press plates can be used to give the wood-based materials an almost lifelike surface feel.
Decorative papers as described above can be produced by known processes. These processes usually comprise the steps of first producing a material stream, which is then fed in succession to at least one headbox, at least one wire section for forming the fibrous material web, at least one press section, at least one dryer section having drying groups, and then to a reel.
Fibrous material webs, especially decorative papers, obtained by to such processes regularly have the features mentioned below. Due to a high dry matter content after the press section, especially when using a shoe press, the paper is influenced in that it experiences less "sticking" to the drying cylinders of the (first) pre-drying group in the dryer section. The term "sticking" is understood here to mean especially the adhesion of the moist paper web to the hot cylinder surface.
The cellulose fibres usually used for paper production swell when moisture/water is absorbed and shrink when water is released. As a result, the fibrous material web shrinks in the dryer section by approximately 1 - 5% over the entire dewatering and drying process. Due to the described "sticking", the paper web is hindered in its shrinkage.
When the fibrous material web then comes into contact with printing ink and/or resin during application to a surface and/or during the printing process, the paper can change size again and "grow". This takes place to approximately a similar degree as shrinkage during drying. Since, when using a shoe press, the paper web is drier when it enters the dryer section, it adheres less to the drying cylinder and
3 thus shrinks to a greater extent, which leads to higher paper growth in the subsequent finishing process.
Such paper growth, which can also be referred to as wet elongation, is only suitable to a limited extent, especially for dimension-critical decorations.
Therefore, the known processes for producing decorative papers are in need of improvement.
The present invention addresses this need.
Especially, a process is to be provided with which high-quality fibrous material webs can be produced which are distinguished, among other things, by high porosity, wet strength, light fastness and colour consistency. The process should be as simple and economical as possible. Furthermore, the shrinkage of the paper during the production process should be as defined as possible, so that the subsequent "waxing" of the paper during the printing and/or impregnation is as constant and reproducible as possible.
This aim was addressed by a process according to claim 1, i.e. by a process for producing a fibrous material web, especially a decorative paper, the process comprising the following steps:
- providing a fibrous material stream - supplying the fibrous material stream in this sequence into at least one fibrous material headbox, into at least one wire section for forming a fibrous material web, into at least one press section, and into at least one dryer section having drying groups, characterised in that a dry matter content of the fibrous material web in the range from 45 wt.% to 60 wt.% is established in the press section, and in that the fibrous material web is moistened after or in the dryer section partially or completely by means of an aqueous medium, wherein from 2% to 30%, especially from 4% to 20%, preferably from 6% to 15%, in relation to the area density of the fibrous material web, of water is applied to the fibrous material web.
The expression "in relation to the area density of the fibrous material web"
refers to the area density of the fibrous material web produced according to the process and
Such paper growth, which can also be referred to as wet elongation, is only suitable to a limited extent, especially for dimension-critical decorations.
Therefore, the known processes for producing decorative papers are in need of improvement.
The present invention addresses this need.
Especially, a process is to be provided with which high-quality fibrous material webs can be produced which are distinguished, among other things, by high porosity, wet strength, light fastness and colour consistency. The process should be as simple and economical as possible. Furthermore, the shrinkage of the paper during the production process should be as defined as possible, so that the subsequent "waxing" of the paper during the printing and/or impregnation is as constant and reproducible as possible.
This aim was addressed by a process according to claim 1, i.e. by a process for producing a fibrous material web, especially a decorative paper, the process comprising the following steps:
- providing a fibrous material stream - supplying the fibrous material stream in this sequence into at least one fibrous material headbox, into at least one wire section for forming a fibrous material web, into at least one press section, and into at least one dryer section having drying groups, characterised in that a dry matter content of the fibrous material web in the range from 45 wt.% to 60 wt.% is established in the press section, and in that the fibrous material web is moistened after or in the dryer section partially or completely by means of an aqueous medium, wherein from 2% to 30%, especially from 4% to 20%, preferably from 6% to 15%, in relation to the area density of the fibrous material web, of water is applied to the fibrous material web.
The expression "in relation to the area density of the fibrous material web"
refers to the area density of the fibrous material web produced according to the process and
4 not to the area density of the fibrous material web at the location of the moistening.
In other words, for a fibrous material web produced according to the process with an area density of 100 g/m2, a total of 2 g/m2 to 30 g/m2 of water is applied to the fibrous material web (moistened).
The feature "partially or completely moistened by means of a water-containing medium" means that the fibrous material web is moistened in the running direction of the fibrous material web transversely or longitudinally either only in predetermined regions (partially) or over the entire width, so that especially by these two measures - targeted strong drying and targeted re-moistening of the fibrous material web - a wet elongation behaviour of the fibrous material web according to Miitek of 2.0% to 4.0% transversely to the machine running direction and of 0.5% to 1.5% longitudinally in the machine running direction can be established, moreover preferably at very high speeds of the fibrous material web of up to 1100 nn/min.
In conventional press concepts, the dry matter content is preferably established in the range of 46 wt.% to 53 wt.%, and in shoe presses preferably in the range of 52 wt.% to 58 wt.%.
Subsequently, the fibrous material web can first be smoothed, if necessary, and then fed to a reel for easier storage and/or easier transport.
The fibrous material web thus produced is especially a decorative paper.
In the present text, the term "comprise" shall also mean "consisting of".
All norms and standards mentioned in this text and in the examples and claims refer to those valid on the priority date. If no priority is claimed, the standards and norms referred to in the text and in the examples and claims refer to those in force on the filing date.
The process according to the invention is characterised especially in that the amount of water/moisture applied after or in the dryer section re-creates the "sticking" described above, which reduces subsequent elongation in the event of liquid contact, e.g. during the printing process or during impregnation.
In other words, for a fibrous material web produced according to the process with an area density of 100 g/m2, a total of 2 g/m2 to 30 g/m2 of water is applied to the fibrous material web (moistened).
The feature "partially or completely moistened by means of a water-containing medium" means that the fibrous material web is moistened in the running direction of the fibrous material web transversely or longitudinally either only in predetermined regions (partially) or over the entire width, so that especially by these two measures - targeted strong drying and targeted re-moistening of the fibrous material web - a wet elongation behaviour of the fibrous material web according to Miitek of 2.0% to 4.0% transversely to the machine running direction and of 0.5% to 1.5% longitudinally in the machine running direction can be established, moreover preferably at very high speeds of the fibrous material web of up to 1100 nn/min.
In conventional press concepts, the dry matter content is preferably established in the range of 46 wt.% to 53 wt.%, and in shoe presses preferably in the range of 52 wt.% to 58 wt.%.
Subsequently, the fibrous material web can first be smoothed, if necessary, and then fed to a reel for easier storage and/or easier transport.
The fibrous material web thus produced is especially a decorative paper.
In the present text, the term "comprise" shall also mean "consisting of".
All norms and standards mentioned in this text and in the examples and claims refer to those valid on the priority date. If no priority is claimed, the standards and norms referred to in the text and in the examples and claims refer to those in force on the filing date.
The process according to the invention is characterised especially in that the amount of water/moisture applied after or in the dryer section re-creates the "sticking" described above, which reduces subsequent elongation in the event of liquid contact, e.g. during the printing process or during impregnation.
5 Furthermore, the process is kept simple and allows for an economically advantageous implementation due to high web speeds. The fibrous material webs produced in this way are additionally characterised by high porosity, wet strength, light fastness and colour consistency.
In the process according to the invention, a fibrous material stream is first provided. This fibrous material stream is preferably characterised in that it comprises or consists of pulp fibres of hardwoods or softwoods, or a mixture thereof, the fibre length of which is preferably in the range of 0.6 mm to 3 mm, especially in the range of 0.8 mm to 2 mm. Furthermore, the fibrous material stream may contain various fillers, such as titanium dioxide, kaolin, etc.
and/or colour pigments and/or other additives and/or various functional chemicals, such as wet-strength agents, or the like and/or production aids, such as retention agents and defoamers. The usual consistency in the headbox is usually 0.5 wt.% to 2 wt.%, especially 0.8 wt.% to 1.5 wt.%.
In the process according to the invention, the fibrous material stream is then passed into at least one headbox and into at least one wire section to form a fibrous material web.
The headbox is usually a type of nozzle by means of which the fibrous material stream is applied evenly across the width in quantity and consistency to an endless circulating wire, through which the solids are separated from the water content.
During the dewatering process, a uniform fibre mat forms on the wire, which is the starting point for the subsequent paper. The solids content at the end of the wire section is preferably 15 wt.% to 25 wt.%, especially in the range of 18 wt.%
to 22 wt.%.
In the process according to the invention, the fibrous material web is then fed into at least one press section.
In the press section, the fibre mat produced in the wire section is preferably further dewatered. For this purpose, it is usually pressed out with the support of felts. This can be done, for example, between two rollers pressed against each other. The felts used here have the function of transporting the web through the press section without destroying it and of absorbing the pressed-out water in the press nip.
In the process according to the invention, a fibrous material stream is first provided. This fibrous material stream is preferably characterised in that it comprises or consists of pulp fibres of hardwoods or softwoods, or a mixture thereof, the fibre length of which is preferably in the range of 0.6 mm to 3 mm, especially in the range of 0.8 mm to 2 mm. Furthermore, the fibrous material stream may contain various fillers, such as titanium dioxide, kaolin, etc.
and/or colour pigments and/or other additives and/or various functional chemicals, such as wet-strength agents, or the like and/or production aids, such as retention agents and defoamers. The usual consistency in the headbox is usually 0.5 wt.% to 2 wt.%, especially 0.8 wt.% to 1.5 wt.%.
In the process according to the invention, the fibrous material stream is then passed into at least one headbox and into at least one wire section to form a fibrous material web.
The headbox is usually a type of nozzle by means of which the fibrous material stream is applied evenly across the width in quantity and consistency to an endless circulating wire, through which the solids are separated from the water content.
During the dewatering process, a uniform fibre mat forms on the wire, which is the starting point for the subsequent paper. The solids content at the end of the wire section is preferably 15 wt.% to 25 wt.%, especially in the range of 18 wt.%
to 22 wt.%.
In the process according to the invention, the fibrous material web is then fed into at least one press section.
In the press section, the fibre mat produced in the wire section is preferably further dewatered. For this purpose, it is usually pressed out with the support of felts. This can be done, for example, between two rollers pressed against each other. The felts used here have the function of transporting the web through the press section without destroying it and of absorbing the pressed-out water in the press nip.
6 In the process according to the invention, the pressed fibrous material web is then fed into at least one dryer section with drying groups.
The dryer section usually consists mainly of steam-heated cylinders that are brought into contact with the paper web in order to heat it to such an extent that the water still in the paper web evaporates to the desired final moisture content.
These successive drying cylinders are preferably combined to form so-called drying groups. These drying groups can be supplied with steam in different ways in order to control the drying process.
In the process according to the invention, a dry matter content of the fibrous material web in the range of about 45 wt.% to 60 wt.% is established in the press section.
From an energy perspective, the aim is usually to achieve the highest possible dry matter content. From a technical perspective, however, there are limitations.
In conventional rollers/presses, dry matter contents from 46 wt.% to 53 wt.% can be achieved, depending on the material input.
When using one or more shoe presses, dry matter contents of up to 60 wt.% can be achieved, especially in the range from 52 wt.% to 58 wt.%. Too much pressure can destroy the paper web, whilst excessively low dry matter contents can lead to running problems or result in higher steam consumption in the subsequent dryer section, which in turn leads to higher drying costs.
According to the process of the invention, the fibrous material web is moistened in the dryer section. Here, a water application from 0.8 g/m2 to 45 g/m2 or 1 nril/rn2 to 30 ml/m2 is preferred. Preferred ranges include, especially: 1 nril/rn2 to 15 ml/m2, 2 nril/rn2 to 15 ml/m2, 1 nril/rn2 to 10 nril/rn2 or 2 nril/rn2 to 6 ml/m2.
Depending on the area density of the fibrous material web, the amount of water to be applied, and thus also the water content of the medium, can be adjusted in relation to the area density of the fibrous material web in the range from 2%
to 30%, especially in the range from 4% to 20%, preferably in the range from 6%
to 15%.
The process according to the invention is further preferably characterised in that the press section comprises a laying press, especially a shoe press.
The dryer section usually consists mainly of steam-heated cylinders that are brought into contact with the paper web in order to heat it to such an extent that the water still in the paper web evaporates to the desired final moisture content.
These successive drying cylinders are preferably combined to form so-called drying groups. These drying groups can be supplied with steam in different ways in order to control the drying process.
In the process according to the invention, a dry matter content of the fibrous material web in the range of about 45 wt.% to 60 wt.% is established in the press section.
From an energy perspective, the aim is usually to achieve the highest possible dry matter content. From a technical perspective, however, there are limitations.
In conventional rollers/presses, dry matter contents from 46 wt.% to 53 wt.% can be achieved, depending on the material input.
When using one or more shoe presses, dry matter contents of up to 60 wt.% can be achieved, especially in the range from 52 wt.% to 58 wt.%. Too much pressure can destroy the paper web, whilst excessively low dry matter contents can lead to running problems or result in higher steam consumption in the subsequent dryer section, which in turn leads to higher drying costs.
According to the process of the invention, the fibrous material web is moistened in the dryer section. Here, a water application from 0.8 g/m2 to 45 g/m2 or 1 nril/rn2 to 30 ml/m2 is preferred. Preferred ranges include, especially: 1 nril/rn2 to 15 ml/m2, 2 nril/rn2 to 15 ml/m2, 1 nril/rn2 to 10 nril/rn2 or 2 nril/rn2 to 6 ml/m2.
Depending on the area density of the fibrous material web, the amount of water to be applied, and thus also the water content of the medium, can be adjusted in relation to the area density of the fibrous material web in the range from 2%
to 30%, especially in the range from 4% to 20%, preferably in the range from 6%
to 15%.
The process according to the invention is further preferably characterised in that the press section comprises a laying press, especially a shoe press.
7 After the formation of a fibrous material web in the wire section, the fibrous material web must be further dewatered. The dry matter content is usually increased here by mechanical pressure perpendicular to the surface of the fibrous material web. This is done in the so-called press section. Here, the fibrous material web is usually treated between rollers with special pressures. The water pressed out of the fibrous material web is regularly absorbed here by felts that are applied to the corresponding rollers.
For this purpose, presses in conventional roller-roller or shoe-roller design are preferably used.
Shoe presses are known in paper production and usually comprise a shoe that presses against a rotating counter roller. A flexible plastic sleeve supported by an oil film can float here on the shoe. The rotating counter roller is usually covered with a felt to remove the pressed-out water.
After pressing the fibrous material web, during which dry matter contents from 45 wt.% to 60 wt.% are achieved, the moisture remaining in the fibrous material web must be further removed. This is usually done by evaporation and/or the effect of vacuum. The most common process here is contact drying on steam-heated cylinders. Here, the thermal energy is transferred by direct contact from the outer walls of the drying cylinders to the surface of the fibrous material web. The dryer section consists of multiple drying cylinders, over which the fibrous material web is usually brought alternately once with the top side and once with the bottom side.
Single-row as well as conventional double-row drying groups can be used for this purpose.
The process according to the invention is further preferably characterised in that the moistening with the water-containing medium is carried out by means of a nozzle moistening, especially by atomising a water-air mixture, especially via a two-substance nozzle.
In a practical embodiment, a nozzle moistener with two-substance nozzles and/or with pneumatic atomiser nozzles is used as a contactless application unit. The flow rate of the water-air mixture is preferably adjustable and/or controllable sectionally in the running direction of the fibrous material web and/or in the transverse
For this purpose, presses in conventional roller-roller or shoe-roller design are preferably used.
Shoe presses are known in paper production and usually comprise a shoe that presses against a rotating counter roller. A flexible plastic sleeve supported by an oil film can float here on the shoe. The rotating counter roller is usually covered with a felt to remove the pressed-out water.
After pressing the fibrous material web, during which dry matter contents from 45 wt.% to 60 wt.% are achieved, the moisture remaining in the fibrous material web must be further removed. This is usually done by evaporation and/or the effect of vacuum. The most common process here is contact drying on steam-heated cylinders. Here, the thermal energy is transferred by direct contact from the outer walls of the drying cylinders to the surface of the fibrous material web. The dryer section consists of multiple drying cylinders, over which the fibrous material web is usually brought alternately once with the top side and once with the bottom side.
Single-row as well as conventional double-row drying groups can be used for this purpose.
The process according to the invention is further preferably characterised in that the moistening with the water-containing medium is carried out by means of a nozzle moistening, especially by atomising a water-air mixture, especially via a two-substance nozzle.
In a practical embodiment, a nozzle moistener with two-substance nozzles and/or with pneumatic atomiser nozzles is used as a contactless application unit. The flow rate of the water-air mixture is preferably adjustable and/or controllable sectionally in the running direction of the fibrous material web and/or in the transverse
8 direction. Preferably, each nozzle is individually adjustable and/or controllable. The temperature of the water is expediently 20 to 95 C, preferably 40 C to 90 C, for good atomisation.
The aqueous medium is preferably free of dyes so that the colour of the fibrous material web is not changed.
The process according to the invention is further preferably characterised in that the moistening is adjustable transversely to the fibrous web.
This has the advantage that the adhesion of the web can be controlled over the width.
According to the invention, the fibrous material web is re-moistened after or in the dryer section.
The process according to the invention is further preferably characterised in that the moistening takes place at the beginning of the first drying group.
It is preferred that the moistening takes place at a paper web moisture of between 30 wt.% to 50 wt.%, preferably at 42 to 52 wt.%. Preferably, the moistening takes place on a vacuum roller.
The process according to the invention is further preferably characterised in that the moistening takes place in a dry matter content range of the paper web from 50 wt.% to 70%, preferably at 48 to 68 wt.%.
The process according to the invention is further preferably characterised in that the fibrous material web is guided at a speed in the range from 500 m/min to 1100 nn/min, especially at 700 nn/min to 900 nn/min.
The use of shoe presses especially enables a high speed of the fibrous material web.
With the process according to the invention, the fibre orientation is preferably longitudinal to transverse to influence the growth. Preferably, this is to be adjusted by the V-jet over the headbox. The term V-jet means the difference in velocity between the material stream exiting the headbox and the wire velocity.
The aqueous medium is preferably free of dyes so that the colour of the fibrous material web is not changed.
The process according to the invention is further preferably characterised in that the moistening is adjustable transversely to the fibrous web.
This has the advantage that the adhesion of the web can be controlled over the width.
According to the invention, the fibrous material web is re-moistened after or in the dryer section.
The process according to the invention is further preferably characterised in that the moistening takes place at the beginning of the first drying group.
It is preferred that the moistening takes place at a paper web moisture of between 30 wt.% to 50 wt.%, preferably at 42 to 52 wt.%. Preferably, the moistening takes place on a vacuum roller.
The process according to the invention is further preferably characterised in that the moistening takes place in a dry matter content range of the paper web from 50 wt.% to 70%, preferably at 48 to 68 wt.%.
The process according to the invention is further preferably characterised in that the fibrous material web is guided at a speed in the range from 500 m/min to 1100 nn/min, especially at 700 nn/min to 900 nn/min.
The use of shoe presses especially enables a high speed of the fibrous material web.
With the process according to the invention, the fibre orientation is preferably longitudinal to transverse to influence the growth. Preferably, this is to be adjusted by the V-jet over the headbox. The term V-jet means the difference in velocity between the material stream exiting the headbox and the wire velocity.
9 Preferred fibre orientations here are longitudinal to transverse in a ratio of 1.0 to 2.2, preferably 1.2 to 2Ø
The process according to the invention is further preferably characterised in that the fibrous material headbox is run over a V-jet in the range from +50 nn/min to -50 nn/min, preferably at +40 nn/min to -40 nn/min.
The process according to the invention is further preferably characterised in that the paper web has a longitudinal/transverse ratio of breaking strength (ISO
1924-2) from 1.0 to 2.2, preferably from 1.2 to 2Ø
The process according to the invention is further preferably characterised in that the fibrous material stream comprises substantially the following pulp types.
Long-fibre pulps such as spruce and pine and short-fibre pulps such as birch, beech, aspen, oak, eucalyptus or mixtures thereof. Especially, eucalyptus pulp from the species Grandis, Urograndis and Globulus or mixtures thereof is used.
The process according to the invention is further preferably characterised in that the fibrous material stream is ground to a Schopper fineness of 16 to 40 .
This can be done together with the filler or exclusively with the pulp. The exclusively pure pulp grinding has the advantage that the refiner sets have a significantly longer service life.
The process according to the invention is further preferably characterised in that the fibrous material stream comprises pulps certified especially according to FSC
and PFSC.
The present invention also relates to a fibrous material web produced by the process described above.
The present invention also relates to a decorative paper produced by the process described above.
The above preferred embodiments of the process according to the invention apply analogously to the fibrous material web or the decorative paper obtainable by this process.
The process according to the invention is further preferably characterised in that the fibrous material headbox is run over a V-jet in the range from +50 nn/min to -50 nn/min, preferably at +40 nn/min to -40 nn/min.
The process according to the invention is further preferably characterised in that the paper web has a longitudinal/transverse ratio of breaking strength (ISO
1924-2) from 1.0 to 2.2, preferably from 1.2 to 2Ø
The process according to the invention is further preferably characterised in that the fibrous material stream comprises substantially the following pulp types.
Long-fibre pulps such as spruce and pine and short-fibre pulps such as birch, beech, aspen, oak, eucalyptus or mixtures thereof. Especially, eucalyptus pulp from the species Grandis, Urograndis and Globulus or mixtures thereof is used.
The process according to the invention is further preferably characterised in that the fibrous material stream is ground to a Schopper fineness of 16 to 40 .
This can be done together with the filler or exclusively with the pulp. The exclusively pure pulp grinding has the advantage that the refiner sets have a significantly longer service life.
The process according to the invention is further preferably characterised in that the fibrous material stream comprises pulps certified especially according to FSC
and PFSC.
The present invention also relates to a fibrous material web produced by the process described above.
The present invention also relates to a decorative paper produced by the process described above.
The above preferred embodiments of the process according to the invention apply analogously to the fibrous material web or the decorative paper obtainable by this process.
10 The present invention also relates to a fibrous material web, especially a decorative paper, preferably obtainable by the process according to the invention, which has at least one of the following properties.
- A wet elongation behaviour according to Miitek of 2.0 to 4.0%, especially of 2.2%
to 3.3% transversely to the machine direction and 0.5 to 1.5%, especially of 0.7 to 1.3% longitudinally in the machine direction.
The wet elongation behaviour according to Miitek is determined here with a Miitek measuring device WSD 02 (Emtec). The measurement parameters include a transverse tension of 4N/60mm and a longitudinal tension of 1N/60rnrn after 25 seconds of one-sided water application. The measurement result transversely is averaged from the measurement locations, in each case 10cm from the edge, from the centre, and from the centre (centre-centre) of the outer and centre measurement.
The wet elongation behaviour according to Miitek is calculated as follows:
Miitek wet elongation transverse = (((TS + DS)/2)) + centre-centre + DS)/3.
Miitek wet elongation longitudinally from the "centre-to-centre" position.
TS, DS and centre-centre mean tending side, drive side and centre-centre as the position between the centre of the web and the TS.
- A real growth of the web due to impregnation from 0.8% to 1.8%, especially from 0.9% to 1.7% transversely to the machine direction and 0.2% to 1.2%, especially 0.3% to 1% longitudinally in the machine direction.
- An area density preferably from 40 g/m2 to 150 g/m2, especially from 45 to 90 g/m2 (ISO 536).
- A porosity according to Gurley from 10 s to 28 s, especially from 14 s to 26 s (ISO
5636-5).
- A filler content of 15 wt.% to 42 wt.%, especially 20 wt.% to 38 wt.% (ISO
2144).
- A Bekk smoothness of 80 s to 220 s, especially 140 s to 210 s on the decorative side (ISO 5627).
- A wet elongation behaviour according to Miitek of 2.0 to 4.0%, especially of 2.2%
to 3.3% transversely to the machine direction and 0.5 to 1.5%, especially of 0.7 to 1.3% longitudinally in the machine direction.
The wet elongation behaviour according to Miitek is determined here with a Miitek measuring device WSD 02 (Emtec). The measurement parameters include a transverse tension of 4N/60mm and a longitudinal tension of 1N/60rnrn after 25 seconds of one-sided water application. The measurement result transversely is averaged from the measurement locations, in each case 10cm from the edge, from the centre, and from the centre (centre-centre) of the outer and centre measurement.
The wet elongation behaviour according to Miitek is calculated as follows:
Miitek wet elongation transverse = (((TS + DS)/2)) + centre-centre + DS)/3.
Miitek wet elongation longitudinally from the "centre-to-centre" position.
TS, DS and centre-centre mean tending side, drive side and centre-centre as the position between the centre of the web and the TS.
- A real growth of the web due to impregnation from 0.8% to 1.8%, especially from 0.9% to 1.7% transversely to the machine direction and 0.2% to 1.2%, especially 0.3% to 1% longitudinally in the machine direction.
- An area density preferably from 40 g/m2 to 150 g/m2, especially from 45 to 90 g/m2 (ISO 536).
- A porosity according to Gurley from 10 s to 28 s, especially from 14 s to 26 s (ISO
5636-5).
- A filler content of 15 wt.% to 42 wt.%, especially 20 wt.% to 38 wt.% (ISO
2144).
- A Bekk smoothness of 80 s to 220 s, especially 140 s to 210 s on the decorative side (ISO 5627).
11 - A longitudinal/transverse ratio of breaking force MD / breaking force CD
(ISO
1924-2) of 1.0 to 2.2, especially of 1.2 to 2Ø
- A width preferably up to 300 cm or up to 227 cm.
Explicitly disclosed herein are also all of the above-mentioned properties individually as well as all possible combinations of the above-mentioned properties.
The above preferred embodiments of the process according to the invention apply analogously to the fibrous material web or the decorative paper per se, especially to the fibrous material web or the decorative paper obtainable by the process according to the invention.
The fibrous material web according to the invention, especially the decorative paper, is preferably characterised in that it is present in the colour shades white, cream, beige, brown, grey and/or black.
The present invention also relates to the use of the fibrous material web as a decorative paper, especially for interior finishing and/or in the furniture industry, preferably for surface finishing of wood-based materials, such as coated boards, tables, floors, kitchen worktops, window sills and/or for exterior applications, such as façades.
The above preferred embodiments of the process according to the invention apply analogously to the use according to the invention.
(ISO
1924-2) of 1.0 to 2.2, especially of 1.2 to 2Ø
- A width preferably up to 300 cm or up to 227 cm.
Explicitly disclosed herein are also all of the above-mentioned properties individually as well as all possible combinations of the above-mentioned properties.
The above preferred embodiments of the process according to the invention apply analogously to the fibrous material web or the decorative paper per se, especially to the fibrous material web or the decorative paper obtainable by the process according to the invention.
The fibrous material web according to the invention, especially the decorative paper, is preferably characterised in that it is present in the colour shades white, cream, beige, brown, grey and/or black.
The present invention also relates to the use of the fibrous material web as a decorative paper, especially for interior finishing and/or in the furniture industry, preferably for surface finishing of wood-based materials, such as coated boards, tables, floors, kitchen worktops, window sills and/or for exterior applications, such as façades.
The above preferred embodiments of the process according to the invention apply analogously to the use according to the invention.
12 Description of the figures Figure 1 shows a schematic representation of a possible device suitable for carrying out the process according to the invention or for producing the fibrous material web according to the invention.
A slalom guidance of the fibrous material web over drying cylinders and vacuum rollers is shown here. This is especially advantageous because the nozzle moistener can be positioned in the lower region of the vacuum rollers, especially between the "3 and 9 o'clock position". This allows excess water to simply drip away downwards without touching the fibrous material web.
Alternatively, the nozzle moistener can also be positioned on vacuum roller 1 or 3.
A single-tier dryer section is especially suitable for this purpose, as here there is free access to the paper web and the water-air mixture can be drawn into the paper web from the nozzle moistener with the help of the vacuum rollers.
The invention will be explained in greater detail below by means of non-limiting examples.
A slalom guidance of the fibrous material web over drying cylinders and vacuum rollers is shown here. This is especially advantageous because the nozzle moistener can be positioned in the lower region of the vacuum rollers, especially between the "3 and 9 o'clock position". This allows excess water to simply drip away downwards without touching the fibrous material web.
Alternatively, the nozzle moistener can also be positioned on vacuum roller 1 or 3.
A single-tier dryer section is especially suitable for this purpose, as here there is free access to the paper web and the water-air mixture can be drawn into the paper web from the nozzle moistener with the help of the vacuum rollers.
The invention will be explained in greater detail below by means of non-limiting examples.
13 Examples To produce a fibrous material web for use as a decorative paper according to the present invention with a real growth in the impregnation channel of 1.1%
transversely and 0.45% longitudinally, the following setting parameters were selected.
Use of a eucalyptus pulp of the Globulus species with a fineness of 21 SR and a filler content consisting of titanium dioxide of 32.5 wt.%, a V-jet of -18 rn/rnin, a shaking index of 2900 [1000/min] at a machine speed of 850 m/min and a line load of the shoe press of 850 KN/m. A water flow rate of 360 l/h was set at the nozzle moistener. The fibrous material web for use as decorative paper was produced as follows:
- providing the fibrous material stream, - supplying the fibrous material stream in this sequence into the fibrous material headbox, into the wire section for forming the fibrous material web, into the press section, and into the dryer section with drying groups.
In the press section (shoe press), a dry matter content of 55 wt.% was established for the fibrous material web. The fibrous material web was moistened again in the dryer section, wherein 4.75%, in relation to the area density of the fibrous material web (72 g/m2), of water was applied to the fibrous material web.
With these settings, a fibrous material web with an area density of 72 g/m2 was produced for use as a decorative paper with a finished roll width of 206 cm, which showed a growth according to Miitek of 2.25% transversely and 0.65%
longitudinally (determined as described above) with a Gurley porosity of 14 s (ISO
5636-5). The longitudinal/transverse ratio of the breaking force (ISO 1924-2) was 1.25. After further impregnations typical for decorative papers, the fibrous material web showed an outstandingly very low real growth of the fibrous material web, which was always in the range of 0.8% to 1.8% transversely to the machine direction and in the range of 0.2% to 1.2% longitudinally in the machine direction.
transversely and 0.45% longitudinally, the following setting parameters were selected.
Use of a eucalyptus pulp of the Globulus species with a fineness of 21 SR and a filler content consisting of titanium dioxide of 32.5 wt.%, a V-jet of -18 rn/rnin, a shaking index of 2900 [1000/min] at a machine speed of 850 m/min and a line load of the shoe press of 850 KN/m. A water flow rate of 360 l/h was set at the nozzle moistener. The fibrous material web for use as decorative paper was produced as follows:
- providing the fibrous material stream, - supplying the fibrous material stream in this sequence into the fibrous material headbox, into the wire section for forming the fibrous material web, into the press section, and into the dryer section with drying groups.
In the press section (shoe press), a dry matter content of 55 wt.% was established for the fibrous material web. The fibrous material web was moistened again in the dryer section, wherein 4.75%, in relation to the area density of the fibrous material web (72 g/m2), of water was applied to the fibrous material web.
With these settings, a fibrous material web with an area density of 72 g/m2 was produced for use as a decorative paper with a finished roll width of 206 cm, which showed a growth according to Miitek of 2.25% transversely and 0.65%
longitudinally (determined as described above) with a Gurley porosity of 14 s (ISO
5636-5). The longitudinal/transverse ratio of the breaking force (ISO 1924-2) was 1.25. After further impregnations typical for decorative papers, the fibrous material web showed an outstandingly very low real growth of the fibrous material web, which was always in the range of 0.8% to 1.8% transversely to the machine direction and in the range of 0.2% to 1.2% longitudinally in the machine direction.
Claims (12)
1. A process for producing a fibrous material web, comprising the steps of:
- providing a fibrous material stream, - supplying the fibrous material stream in this sequence into at least one fibrous material headbox, into at least one wire section for forming a fibrous material web, into at least one press section, and into at least one dryer section having drying groups, characterised in that a dry matter content of the fibrous material web in the range from 45 wt.% to 60 wt.% is established in the press section, and in that the fibrous material web is re-moistened after or in the dryer section partially or completely by means of an aqueous medium, wherein from 2% to 30%, especially from 4% to 20%, preferably from 6% to 15%, in relation to the area density of the fibrous material web, of water is applied to the fibrous material web.
- providing a fibrous material stream, - supplying the fibrous material stream in this sequence into at least one fibrous material headbox, into at least one wire section for forming a fibrous material web, into at least one press section, and into at least one dryer section having drying groups, characterised in that a dry matter content of the fibrous material web in the range from 45 wt.% to 60 wt.% is established in the press section, and in that the fibrous material web is re-moistened after or in the dryer section partially or completely by means of an aqueous medium, wherein from 2% to 30%, especially from 4% to 20%, preferably from 6% to 15%, in relation to the area density of the fibrous material web, of water is applied to the fibrous material web.
2. The process according to claim 1, characterised in that the press section comprises a laying press, especially a shoe press.
3. The process according to at least one of the preceding claims, characterised in that the moistening is carried out by means of a nozzle moistening, especially by atomising a water-gas mixture.
4. The process according to at least one of the preceding claims, characterised in that the moistening is adjustable transversely to the fibrous web.
5. The process according to at least one of the preceding claims, characterised in that the moistening takes place in a dry matter content range of the fibrous material web from 50 wt.% to 70 wt.%, preferably at 48 wt.% to 68 wt.%.
6. The process according to at least one of the preceding claims, characterised in that the fibrous material web is guided at a speed in the range from 500 m/min to 1100 m/min, especially in the range from 700 m/min to 900 m/min.
7. The process according to at least one of the preceding claims, characterised in that the fibrous material headbox is run over a V-jet in the range from +50 m/min to -50 m/min, preferably at +40 m/min to -40 m/min.
8. The process according to at least one of the preceding claims, characterised in that the fibrous material web has a longitudinal/transverse ratio of breaking strength (ISO 1924-2) from 1.0 to 2.2, especially from 1.2 to 2Ø
9. A fibrous material web produced by a method according to at least one of preceding claims 1 to 8.
10. A fibrous material web, preferably according to claim 9, characterised in that it has at least one of the following properties:
- a wet elongation behaviour according to Mütek of 2.0 % to 4.0%, especially of 2.2% to 3.3% transversely to the machine direction and 0.5 to 1.5%, especially of 0.7 % to 1.3% longitudinally in the machine direction, - a real growth of the fibrous material web due to impregnation from 0.8% to 1.8%, especially from 0.9% to 1.7% transversely to the machine direction and 0.2% to 1.2%, especially 0.3% to 1% longitudinally in the machine direction.
- a wet elongation behaviour according to Mütek of 2.0 % to 4.0%, especially of 2.2% to 3.3% transversely to the machine direction and 0.5 to 1.5%, especially of 0.7 % to 1.3% longitudinally in the machine direction, - a real growth of the fibrous material web due to impregnation from 0.8% to 1.8%, especially from 0.9% to 1.7% transversely to the machine direction and 0.2% to 1.2%, especially 0.3% to 1% longitudinally in the machine direction.
11. The fibrous material web according to claim 10, characterised in that it has at least one or any combination of the following properties:
- an area density from 40 g/m2 to 150 g/m2, especially from 45 g/m2 to 90 g/m2 (ISO 536), - a porosity according to Gurley from 10 s to 28 s, especially from 14 s to 26 s (ISO
5636-5), - a filler content of 15 wt.% to 42 wt.%, especially 20 wt.% to 38 wt.% (ISO
2144), - a Bekk smoothness of 80 s to 220 s, especially of 140 s to 210 s on the side to which a decoration can be applied (decorative side) (ISO 5627), - a longitudinal/transverse ratio of breaking force MD / breaking force CD
(ISO
1924-2) of 1.0 to 2.2, especially of 1.2 to 2.0, and/or - a width preferably up to 300 cm or up to 227 cm.
- an area density from 40 g/m2 to 150 g/m2, especially from 45 g/m2 to 90 g/m2 (ISO 536), - a porosity according to Gurley from 10 s to 28 s, especially from 14 s to 26 s (ISO
5636-5), - a filler content of 15 wt.% to 42 wt.%, especially 20 wt.% to 38 wt.% (ISO
2144), - a Bekk smoothness of 80 s to 220 s, especially of 140 s to 210 s on the side to which a decoration can be applied (decorative side) (ISO 5627), - a longitudinal/transverse ratio of breaking force MD / breaking force CD
(ISO
1924-2) of 1.0 to 2.2, especially of 1.2 to 2.0, and/or - a width preferably up to 300 cm or up to 227 cm.
12. Use of the fibrous material web according to claim 9, 10 or 11 as a decorative paper, especially for interior finishing and/or in the furniture industry, preferably for surface finishing of wood-based materials, such as coated boards, tables, floors, kitchen worktops, window sills and/or for exterior applications, such as façades.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021103519.8 | 2021-02-15 | ||
| DE102021103519.8A DE102021103519A1 (en) | 2021-02-15 | 2021-02-15 | Process for the production of a fibrous web |
| PCT/EP2022/053545 WO2022171878A1 (en) | 2021-02-15 | 2022-02-14 | Process for producing a fibrous material web |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3208542A1 true CA3208542A1 (en) | 2022-08-18 |
Family
ID=80623753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3208542A Pending CA3208542A1 (en) | 2021-02-15 | 2022-02-14 | Process for producing a fibrous material web |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4291709A1 (en) |
| CN (1) | CN116848300A (en) |
| BR (1) | BR112023016292A8 (en) |
| CA (1) | CA3208542A1 (en) |
| DE (1) | DE102021103519A1 (en) |
| WO (1) | WO2022171878A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI98387C (en) | 1995-02-01 | 1997-06-10 | Valmet Corp | Process for making surface-treated paper, especially fine paper, and dry end for a paper machine |
| DE10233795A1 (en) * | 2002-07-25 | 2004-02-12 | Voith Paper Patent Gmbh | drying section |
| DE102004060547A1 (en) | 2004-12-16 | 2006-07-06 | Voith Paper Patent Gmbh | Production of paper, cardboard, tissue or fibrous material course using paper-making machine, comprises drying and moistening the edges of the fibrous material |
| DE102008040066A1 (en) | 2008-07-02 | 2010-01-07 | Voith Patent Gmbh | Drying station, for the production/treatment of alpha cellulose paper webs, has controlled spray jets after the final hot cylinders or high temperature drying unit to moisten the web before winding |
| DE102008042730A1 (en) | 2008-10-10 | 2010-04-15 | Voith Patent Gmbh | Method for the production of colored paper, cardboard or tissue web, comprises supplying a prepared fiber material suspension to a machine for the production of material web, where a side of the material web within the machine is colored |
| BR112017010990B1 (en) * | 2014-11-28 | 2021-12-28 | Voith Patent Gmbh | PROCESS AND DEVICE FOR PACKAGING PAPER PRODUCTION |
| DE102018119686A1 (en) | 2018-08-14 | 2020-02-20 | Voith Patent Gmbh | paper machine |
-
2021
- 2021-02-15 DE DE102021103519.8A patent/DE102021103519A1/en active Pending
-
2022
- 2022-02-14 BR BR112023016292A patent/BR112023016292A8/en unknown
- 2022-02-14 WO PCT/EP2022/053545 patent/WO2022171878A1/en active Application Filing
- 2022-02-14 CN CN202280014926.9A patent/CN116848300A/en active Pending
- 2022-02-14 CA CA3208542A patent/CA3208542A1/en active Pending
- 2022-02-14 EP EP22707052.1A patent/EP4291709A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102021103519A1 (en) | 2022-08-18 |
| BR112023016292A2 (en) | 2023-09-05 |
| CN116848300A (en) | 2023-10-03 |
| BR112023016292A8 (en) | 2023-09-26 |
| EP4291709A1 (en) | 2023-12-20 |
| WO2022171878A1 (en) | 2022-08-18 |
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